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NFSD: Make nfsd4_rename() wait before returning NFS4ERR_DELAY

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[ Upstream commit 68c522afd0 ]

nfsd_rename() can kick off a CB_RECALL (via
vfs_rename() -> leases_conflict()) if a delegation is present.
Before returning NFS4ERR_DELAY, give the client holding that
delegation a chance to return it and then retry the nfsd_rename()
again, once.

This version of the patch handles renaming an existing file,
but does not deal with renaming onto an existing file. That
case will still always trigger an NFS4ERR_DELAY.

Link: https://bugzilla.linux-nfs.org/show_bug.cgi?id=354
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2022-09-08 18:14:19 -04:00 committed by Greg Kroah-Hartman
parent 50aa6a80d0
commit d1ee3403e0
1 changed files with 9 additions and 1 deletions
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10
fs/nfsd/vfs.c
View file

@ -1698,7 +1698,15 @@ nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
.new_dir = tdir,
.new_dentry = ndentry,
};
host_err = vfs_rename(&rd);
int retries;
for (retries = 1;;) {
host_err = vfs_rename(&rd);
if (host_err != -EAGAIN || !retries--)
break;
if (!nfsd_wait_for_delegreturn(rqstp, d_inode(odentry)))
break;
}
if (!host_err) {
host_err = commit_metadata(tfhp);
if (!host_err)